Derivative Financial Instruments (Schedule of Changes in Fair Value of Derivatives) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Derivative [Line Items]
Gain (loss) recognized in Other comprehensive income (loss)	$ (2)		$ (12)		$ (24)
Gain (loss) recognized in Earnings (loss)	(34)		(26)		(43)
Tax expense recognized in Other comprehensive income (loss)	68		10		6
Foreign Currency Forwards and Swaps [Member] | Derivatives Not Designated as Hedges [Member]
Derivative [Line Items]
Gain (loss) recognized in Other comprehensive income (loss)	0		0		0
Equity Method Investments' Derivative [Member]
Derivative [Line Items]
Gain (loss) recognized in Earnings (loss)			2		2
Interest Rate Swaps [Member]
Derivative [Line Items]
Tax expense recognized in Other comprehensive income (loss)	3		3		10
Interest Rate Swaps [Member] | Derivatives Designated as Cash Flow Hedges [Member]
Derivative [Line Items]
Gain (loss) recognized in Other comprehensive income (loss)	(2)	[1]	(12)	[2]	(24)	[3]
Interest Rate Swaps [Member] | Derivatives Not Designated as Hedges [Member]
Derivative [Line Items]
Gain (loss) recognized in Other comprehensive income (loss)	0		0		0
Gain (loss) recognized in Earnings (loss)	0		(6)	[4]	(4)	[4]
Interest Expense [Member] | Interest Rate Swaps [Member] | Derivatives Designated as Cash Flow Hedges [Member]
Derivative [Line Items]
Gain (loss) recognized in Earnings (loss)	(11)	[5]	(14)	[5]	(55)	[5]
Foreign Currency Gain (Loss) [Member] | Foreign Currency Forwards and Swaps [Member] | Derivatives Not Designated as Hedges [Member]
Derivative [Line Items]
Gain (loss) recognized in Earnings (loss)	$ (23)	[6]	$ (6)	[6]	$ 16	[6]

[1] Amount excludes $3 million of tax expense recognized in Other comprehensive income (loss).

[2] Amount excludes $2 million of gains associated with the Company’s equity method investments’ derivative activity and $3 million of tax expense recognized in Other comprehensive income (loss).

[3] Amount excludes $2 million of gains associated with the Company’s equity method investments’ derivative activity and $10 million of tax expense recognized in Other comprehensive income (loss).

[4] Included in Interest expense in the consolidated statements of operations.

[5] Amount represents reclassification from Accumulated other comprehensive income (loss), net and is included in Interest expense in the consolidated statements of operations.

[6] Included in Foreign exchange gain (loss), net for operating activity or Other income (expense), net for non-operating activity in the consolidated statements of operations.